[Slimming Paint] Blink-side contiguous allocation of display items.

Source/core/paint/FilterPainter.cpp

Index: Source/core/paint/FilterPainter.cpp
diff --git a/Source/core/paint/FilterPainter.cpp b/Source/core/paint/FilterPainter.cpp
index 3ef7321b7d501cab974dfcbe821b4e43aef8b0a6..47da82d5000f994a88da80d54d830abc042898d6 100644
--- a/Source/core/paint/FilterPainter.cpp
+++ b/Source/core/paint/FilterPainter.cpp
@@ -63,9 +63,8 @@ FilterPainter::FilterPainter(DeprecatedPaintLayer& layer, GraphicsContext* conte
             FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
             OwnPtr<WebFilterOperations> webFilterOperations = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
             builder.buildFilterOperations(filterOperations, webFilterOperations.get());
-            OwnPtr<BeginFilterDisplayItem> filterDisplayItem = BeginFilterDisplayItem::create(*m_layoutObject, imageFilter, rootRelativeBounds, webFilterOperations.release());
-
-            context->displayItemList()->add(filterDisplayItem.release());
+            BeginFilterDisplayItem filterDisplayItem(*m_layoutObject, imageFilter, rootRelativeBounds, webFilterOperations.release());
+            context->displayItemList()->add(filterDisplayItem);
         }
     } else {
         OwnPtr<BeginFilterDisplayItem> filterDisplayItem = BeginFilterDisplayItem::create(*m_layoutObject, imageFilter, rootRelativeBounds);
@@ -81,14 +80,14 @@ FilterPainter::~FilterPainter()
     if (!m_filterInProgress)
         return;
 
-    OwnPtr<EndFilterDisplayItem> endFilterDisplayItem = EndFilterDisplayItem::create(*m_layoutObject);
+    EndFilterDisplayItem endFilterDisplayItem(*m_layoutObject);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context->displayItemList());
         if (m_context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context->displayItemList()->add(endFilterDisplayItem.release());
+        m_context->displayItemList()->add(endFilterDisplayItem);
     } else {
-        endFilterDisplayItem->replay(*m_context);
+        endFilterDisplayItem.replay(*m_context);
     }
 }